[PUP] Keel Cooled, dry exhaust electronic engine question

[LA Licata]

Dear List,

Need help please. If one is to power a 50' full displacement steel  
trawler that has a displacement of about 72000 pounds with a single  
engine, I understand that the rule of thumb is 2-3 HP per 1000 pounds.

The John Deere L1066T is the only keel cooled engine Deere offers. It  
comes in 3 HP sizes, 135 continuous duty, 165 medium duty, and 170  
high output.

Is Medium Duty equivalent "M2" rating?

Is that "good enough" if one wants to cross the atlantic on its own  
bottom or should one be looking for a M1 engine rated for 150-200 hp.

I have asked these questions to John deere directly, with a less than  
forthcoming response

So, if there is another keel cooled, electronic engine that should be  
considered, could someone point it out to me? I could really use the  
help.

TIA

Lee Licata